Method for producing carrying or shopping bags



Oct. 30, 1962 c. HONSEL 3,060,815

METHOD FOR PRODUCING CARRYING OR SHOPPING BAGS Filed June 24, 1959 3 Sheets-Sheet l Cr7/PZ 1704/6 f L C. HONSEL Oct. 30, 1962 METHOD FOR PRODUCING CARRYING OR SHOPPING BAGS 3 She ets-Sheet 2 Filed June 24, 1959 C. HONSEL Oct. 30; 1962 5 Sheets-Sheet 3 Filed June 24, 1959 United States Patent 3,060,815 METHOD FOR PRODUCING CARRYING 0R SHOPPING BAGS arl Hansel, Herforder Str. 285, Bielefeid, Germany Filed June 24, 1959, Ser. No. 822,484 Claims priority, application Germany June 25, 1958 3 Claims. (Cl. 93-65) The present invention relates to paper bags or the like and is particularly concerned with a method for the manu facture of carrying bags.

It is an object of the invention to provide a carrying bag which is devised in a manner to afford particular advantages for the purposes for which it is used, while, on the other hand, it permits faultless machine production by means of machines of great production capacity known per se in this particular art.

Accordingly the forming of the carrying bag is to take place from a flattened tubular section, one end of which is provided with the handle means required for a carrying bag and the other with a bottom which readily assumes the position of use for filling the bag and which affords advantageous standing qualities for a carrying bag. Although the carrying bag does not have side folds along its longitudinal edges, to simplify the production and to save material, it is an object to achieve maximum filling volume by virtue of the rectangular bottom and the stiffening means to be described hereinafter, when it is filled with material of any kind, so that the bag in filled condition will assume a form having pleasingly rounded edges extending vertically from the bottom.

Carrying bags known heretofore and the methods of producing the same do not oifer the advantages offered in accordance with the invention.

In accordance with the invention the continuous web of material of paper, plastic or the like is guided past operating stations for applying handles or carrying loops. After severing the blank of material the tube forming operation is effected by dual transverse folding and transverse gluing.

In accordance with the invention the dual transverse folding and transverse gluing is employed in order to carry out the operations already described and also those which follow, Without changing the direction of production flow of the web of material or of the material blanks cut from it. In this manner it is possible to produce a carrying or shopping bag Without a bottom. In the present case also the transverse bottom edge of this tubular piece is simultaneously glued as the tubular web is glued. This operation then terminates the production of such a carrying bag.

if the carrying bag is to be provided with a bottom plane or surface in an advantageous manner, this bottom forming can be effected in the same machine in which the tubular sections or blanks are produced, or in a second machine known per se, for example, a conventional crossed bottom forming machine. In the latter case the bottom forming is effected on the tubular blank of the carrying bag in an entirely separate operation.

It is also possible, however, for forming the bottoms to proceed in a manner that the blanks of tubular conformation which are provided with the handles or carry ing loops are guided through the same machine in transverse position past the operating stations of a crossed bottom bag machine which suitably operates one-sidedly; thus again without changing the direction of flow of the work blank.

It is also possible, prior to forming the blank of tubular conformation, to prepare the bottom closure along the longitudinal edge opposite the handle side of the web, by alternate longitudinal folding and pertinent application of glue on the closure tongue of the bottom closure formed by cutting, and finish the blanks as the tube is formed. In that event the bag does not have lateral folds along its side edges and therefore consists of a flattened tube section. The bottom of such a bag however is a pleated or fold bottom which, on filling the bag with material, unfolds to form a rectangular standing or bottom surface. 7

The latter methods save the introduction or use of a second machine and make possible the complete production of carrying bags which also have a bottom surface in a single continuous operation without'changing the direction of flow. This means a simplication of the ma chine installation, protection of the blanks against wear, as well as a more rapid production method which necessarily results in increased production with the machine.

Further objects and details of the invention will become apparent from the embodiment described in the specification and illustrated in the drawing in which:

FIG. 1 is a plan view of a web up to the point where a blank is cut oif,

FIG. 2 is a portion of a work blank,

FIG. 3 is a work blank with handles glued into place,

PEG. 4 is a partly folded work blank,

FIG. 5 is a top view of a completely folded carrying FIG. 6 is a longitudinal section through a carrying bag in accordance with FIG. 5,

FIG. 6a is a view of the fold bottom of the bag in accordance with FIG. 6, drawn to an enlarged scale,

FIG. 7 is a plan view of the bag in accordance with FIG. 6 with the fold bottom of the crossed bottom type drawn up and folded over,

FIG. 8 is a side elevational view of an apparatus for drawing up and folding over the fold bottom,

FIG. 9 is a plan view of the apparatus in accordance with FIG. 8,

FIG. 10 shows the lower end of the carrying bag before the fold bottom is drawn up,

FIG. 11 shows the bag in accordance with FIG. 10 with the fold bottom partly drawn up, and

FIG. 12 illustrates the carrying bag of FIG. 10 with the folded bottom completely pulled up.

The paper web 2 drawn from the roll 1 is provided with glue strips 3 whereupon the edge 4 of the filling end is turned over with a longitudinal folding means.

The cutting of the gluing fold 8 is effected by a special cutting apparatus and the folding of the bottom surface 7 which is being developed is performed by means of a longitudinal folding device. A further longitudinal folding apparatus provides for again turning over the gluing fold 8 relative to the longitudinal fold 7 and for applying glue thereto.

Thereupon the severing of the work blank is effected.

It is possible by means of a special carrying handle device to glue on prepared handles or grips 11 with cover sheets 12 or the handles 11 can be formed in the machine proper and the cover sheets can be glued on later.

The blank thus prepared is then folded over along line 13 and glue strip 14 is applied to the projecting flap 15. The flap 15 is then folded over on the work blank 10. The carrying bag completely folded in this manner will then have a bottom closure in the form of a pleated bottom. Eliminating the longitudinal folding device for forming a the fold 7 produces a carrying bag without a folded bottom. It is also possible to eliminate both longitudinal folding devices for the pleat or fold 7 as well as that for the folded over gluing fold 8 and subsequently, while maintaining the same direction of material feed to place a crossed bottom on the tube in the manner as is customary in a crossed bottom valve bag producing machine,

which in that event operates only on one of its sides. It is also possible by means of the same method to form carrying bags with punched out handles in which case the strengthening inserts 12 are of cardboard and the gluing in of the handles 11 becomes .unnecessary and instead the handle forms are punched into the otherwise finished bag upon completion of the corresponding operation.

' The blank prepared by means of the foregoing operations is indicated at W. Coming from the right, as viewed in FIG. 8, again in transverse position, i.e. without change in the longitudinal feeding direction of the blank in transverse position, it is seized by the folding grip'cylinder 16 associated with the folding blade cylinder 17 and is fed by way of the guide roller 16a to the grooving cylinder 18 which is associated with a counter roller 19. Circulating conveyor chains 20, 21 which are in firm engagement with one another forward the blank W. Obliquely extending grooves 32, 63 (FIGS. 9 and 10) for triangular bottom pockets 34, 35 are formed by the pre-grooving cylinder 18 at both ends of the bottom which is to be produced, which grooves extend at an angle of 45.

The blank then passes to a flattening device 24 to arrive in the area of the suction devices 22, 23 provided on hollow shafts 22a, 23a which draw in the side planes 7 and 8 of the fold bottom (FIG. 6a). The drive for these rotating suction means 22, 23 is indicated in FIG. 8 and comprises the bevelled wheels 36, 3-7. The finger which is moved about shaft 24b, constituting the flattening device 24, enters the flattened surfaces 7 and 8 partly opened by the suction devices 22, 26 and turns the one side plane 8 of the bobbin about itself to an extent of 180 against the rigid form plate 25.

The triangular bottom pockets which are being formed are indicated in FIG. 11 at 34a and 35a. The corner dent withdrawing devices 26, 27 then enter into these triangular pockets 34a and 35a which are being formed and flatten them. A pressing arrangement comprising the segment 28 with a counter roller 29 serves for pressing the flattened bottom pockets.

The finger 30 in the discharge cylinder 31 takes over the completed carrying bag and transports it to the discharge position 32. The pull-up device for the triangular bottom pockets which are being formed may differ in construction. The rectangular bottom of the finished carrying pocket in accordance with FIG. 12 is indicated at 36. If this cairying bag is filled, then the triangular bottom pockets 34 and 35 swing upwardly and the bottom plane 36 provides the standing surface for the carrying bag 35 which is being filled. These bottom triangles 34 and 35 which consist of several layers of paper provide for strengthening of the material thus taking care of stiffening the bottom '36 and insuring rapid opening of this bottom.

It should be noted that the individual machine components, the longitudinal folding device and the transverse folding device, the glue applying devices, the pre-grooving means, the flattening devices, corner dent withdrawing devices, as well as the pressing'devices with which we are concerned here are entirely a part of the state of the art so that the drawing does not show details of these devices. The invention is primarily concerned with the sequence of the application of these machine components and the resultant cooperation of these independent components.

Having now described my invention with reference to the embodiment illustrated in the drawings, I do not wish to be limited thereto, but what I desire to protect by Letters Patent of the United States is set forth in the appended claims.

I claim:

1. Method for manufacturing carrying or shopping bags of the type having handles by means of a machine supplied from a roll of material with a continuous web having two longitudinal borders, said bags having a bottom portion formed from one said border and a top portion formed from the other said border, and said method comprising the steps of treating said two longitudinal borders of the web while traveling in the same direction to cut out a bottom gluing flap along the one said border and folding over said one said border to prepare a bottom, turning over said gluing flap, simultaneously preparing the other said border for fastening handles thereto, cutting blanks from said web of a length corresponding to substantially twice the Width of the ultimate folded bags and that of a transverse gluing strip, applying handles to adjacent sides of the top portions of the bags to be formed, applying glue to said gluing flap and to a transverse portion defining a gluing strip, folding said blanks along a line transversely of the direction of travel and folding over said gluing strips to form tubes disposed transversely of the direction of travel and completing the forming of the bottom portions of the bags while oriented and traveling in the same direction.

2. Method for manufacturing carrying or shopping bags of the type having handles by means of a machine supplied from a roll of material with a continuous web having two longitudinal borders, said bags having a bottom portion formed from one said border and a top portion formed from the other said border, and said method comprising the steps of treating said two longitudinal borders of the web while traveling in the same direction to cut out a bottom gluing flap along the one said border and folding over said one said border to prepare a bottom, turning over said gluing flap, simultaneously preparing the other said border for fastening handles thereto, cutting blanks from said Web of a length corresponding to substantially twice the width of the ultimate folded bags and that of a transverse gluing strip, applying handles to adjacent sides of the top portions of the bags to be formed,

applying glue to said gluing flap and to a transverse portion defining a gluing strip, folding said blanks along a line transversely of the direction of travel and folding over said gluing strips to form tubes disposed transversely of the direction of travel and completing the forming of the bottom portions of the bags while oriented and traveiing in the same direction by drawing up and folding over the upper layer of the folded border defining said bottom.

3. Method for manufacturing carrying 'or shopping bags of the type having handles by means of a machine supplied from a roll of material with a continuous web having two longitudinal borders, said bags having a bottom portion formed from one said border and a top portion formed from the other said border, and said method comprising the steps of treating said two longitudinal borders of the web while traveling in the same direction to cut out a bottom gluing flap along the one said border and folding over said one said border to prepare a bottom, turning over said gluing flap, simultaneously preparing the other said border for fastening handles thereto, cutting blanks from said web of a length corresponding to substantially twice the width of the ultimate folded bags and that of a transverse gluing strip, applying handles to adjacent sides of the top portions of the bags to be formed by gluing the ends of the handles onto said sides with reinforcing strips, applying glue to said gluing flap and to a transverse portion defining a gluing strip, folding said blanks along a line transversely of the direction of travel and folding over said gluing strips to form tubes disposed transversely of the direction of travel and completing the forming of the bottom portions of the bags while oriented and traveling in the same direction.

References Cited in the file of this patent UNITED STATES PATENTS 326,592 Sawyer Sept.'22, 1885 2,469,536 Winsett May 10,1949 2,707,421 Rawe May 3, 1955 2,730,934 Van der Meulen Jan. 17, 1956 2,758,519 Steen Aug. 14, 1956 

